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import json
from six.moves.urllib import parse
from mod_pywebsocket import msgutil

connections = {}


def web_socket_do_extra_handshake(request):
    pass  # Always accept.


def web_socket_transfer_data(request):
    global connections
    r = request.ws_resource.split('?', 1)
    if len(r) == 1:
        return
    param = parse.parse_qs(r[1])
    if 'p' not in param:
        return
    page_group = param['p'][0]
    if page_group in connections:
        connections[page_group].add(request)
    else:
        connections[page_group] = set([request])
    message = None
    dataToBroadcast = {}
    try:
        message = msgutil.receive_message(request)
        # notify to client that message is received by server.
        msgutil.send_message(request, message)
        msgutil.receive_message(request)
        dataToBroadcast['message'] = message
        dataToBroadcast['closeCode'] = str(request.ws_close_code)
    finally:
        # request is closed. notify this dataToBroadcast to other WebSockets.
        connections[page_group].remove(request)
        for ws in connections[page_group]:
            msgutil.send_message(ws, json.dumps(dataToBroadcast))
